Dr. Daniel R. Schläpfer Profile

Dr. Daniel R. Schläpfer

at ReSe Applications LLC

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Publications (18)

Proceedings Article | 18 August 2009 Paper

Spectral Angle Mapper (SAM) for anisotropy class indexing in imaging spectrometry data

J. Weyermann, D. Schläpfer, A. Hueni, M. Kneubühler, M. Schaepman

Proceedings Volume 7457, 74570B (2009) https://doi.org/10.1117/12.825991

KEYWORDS: Reflectivity, Anisotropy, Sensors, Bidirectional reflectance transmission function, Vegetation, Imaging spectrometry, Detection and tracking algorithms, Image classification, Image processing, Spectroscopy

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Proceedings Article | 13 October 2008 Paper

Evaluation of the atmospheric correction procedure for the APEX level 2/3 processor

Daniel Schläpfer, Jan Biesemans, Andreas Hueni, Koen Meuleman

Proceedings Volume 7107, 710709 (2008) https://doi.org/10.1117/12.799884

KEYWORDS: Atmospheric corrections, Reflectivity, Bidirectional reflectance transmission function, Aerosols, Visible radiation, Image processing, Hyperspectral imaging, Calibration, Data acquisition, Sensors

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The Airborne Prism Experiment (APEX) is a hyperspectral instrument built in a Swiss - Belgian collaboration within the ESA-PRODEX program. It aims at highest possible accuracy of its delivered surface reflectance image data products. The atmospheric correction of hyperspectral imagery is a critical element of a complete processing chain towards unbiased reflectance and for the creation of higher level products. As the first data of APEX is expected to become available in 2009, an appropriate processing chain for higher level processing needs to be defined and evaluated. Standard products have been identified in all application fields of hyperspectral imaging, i.e., geology, vegetation, cryosphere, limnology and atmosphere. They are being implemented at the APEX science center. The according processing procedures rely on data of well-defined processing states which range from calibrated at-sensor radiance to (bihemispherical) spectral albedo. In this paper, the atmospheric processing which is implemented as part of the automated data processing chain for level 2 in the APEX processing and archiving facility (PAF) at VITO (Mol, Belgium) is evaluated together with the ATCOR-4 atmospheric correction program. The evaluation is done regarding flexibility, reflectance output accuracy and processing efficiency. Two test data sets are taken for this purpose: a well-documented set of HYMAP data and a high resolution HYSPEX data set. Both data sets exhibit areas of overlap, which are taken for self-contained analysis of the atmospheric correction procedure. The accuracy tests include plausibility checks on selected regions of interest including a variety of known surfaces in the imagery. As some of the observed effects are related to BRDF differences, the results also give an indication for the inaccuracy related to these reflectance anisotropies. Speed measurements of the processing are then compared to the demand for operational processing of series of data acquisition. Further comparison information is drawn from the by-products of atmospheric correction such as water vapor distribution maps. The study shows performance and limitations of atmospheric correction using the state-of-the-art technology, which are mainly found in the field of BRDF effects. This points towards improvements to be implemented in course of the further development of the higher level processing chain for the APEX sensor.

Proceedings Article | 7 May 2007 Paper

Spatial misregistration detection for hyperspectral sensor using in-flight data

F. Dell'Endice, J. Nieke, D. Schläpfer, K. Itten

Proceedings Volume 6565, 65651F (2007) https://doi.org/10.1117/12.718591

KEYWORDS: Sensors, Signal to noise ratio, Short wave infrared radiation, Prisms, Charge-coupled devices, Distortion, Spectroscopy, Hyperspectral imaging, Scanners, Point spread functions

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Proceedings Article | 1 November 2005 Paper

Aerosol retrieval for APEX airborne imaging spectrometer: a preliminary analysis

Felix Seidel, Jens Nieke, Daniel Schläpfer, Robert Höller, Wolfgang von Hoyningen-Huene, Klaus Itten

Proceedings Volume 5979, 59791W (2005) https://doi.org/10.1117/12.646829

KEYWORDS: Aerosols, Atmospheric modeling, Reflectivity, Atmospheric particles, Sensors, Spectroscopy, Absorption, Near ultraviolet, Atmospheric optics, Spatial resolution

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Proceedings Article | 4 November 2004 Paper

Calibration methodology for the airborne dispersive pushbroom imaging spectrometer (APEX)

Jens Nieke, Johannes Kaiser, Daniel Schlaepfer, Jason Brazile, Klaus Itten, Peter Strobl, Michael Schaepman, Gerd Ulbrich

Proceedings Volume 5570, (2004) https://doi.org/10.1117/12.566364

KEYWORDS: Calibration, Spectroscopy, Spectral calibration, Sensors, Data acquisition, Algorithm development, Short wave infrared radiation, Optical filters, Collimators, Atmospheric modeling

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Proceedings Article | 26 October 2004 Paper

APEX: current status of the airborne dispersive pushbroom imaging spectrometer

Jens Nieke, Klaus Itten, Johannes Kaiser, Daniel Schlapfer, Jason Brazile, Walter Debruyn, Koen Meuleman, Pieter Kempeneers, Andreas Neukom, Hans Feusi, Peter Adolph, Renzo Moser, Thomas Schilliger, Marie van Quickelberghe, John Alder, Dominique Mollet, Lieve De Vos, Peter Kohler, Markus Meng, Jens Piesbergen, Peter Strobl, Michael Schaepman, Jose Gavira, Gerd Ulbrich, Roland Meynart

Proceedings Volume 5542, (2004) https://doi.org/10.1117/12.561430

KEYWORDS: Spectroscopy, Calibration, Algorithm development, Sensors, Human-machine interfaces, Prisms, Short wave infrared radiation, Imaging systems, Data acquisition, Computing systems

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Proceedings Article | 14 October 2004 Paper

Cluster versus grid for large-volume hyperspectral image preprocessing

Jason Brazile, Michael Schaepman, Daniel Schlapfer, Johannes Kaiser, Jens Nieke, Klaus Itten

Proceedings Volume 5548, (2004) https://doi.org/10.1117/12.559849

KEYWORDS: Calibration, Resolution enhancement technologies, Data processing, Prototyping, Spectroscopy, Sensors, Standards development, Hyperspectral imaging, Remote sensing, Atmospheric corrections

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Proceedings Article | 2 February 2004 Paper

MERIS/ENVISAT vicarious calibration over land

Mathias Kneubuehler, Michael Schaepman, Kurtis Thome, Daniel Schlapfer

Proceedings Volume 5234, (2004) https://doi.org/10.1117/12.510449

KEYWORDS: Calibration, Atmospheric modeling, Data modeling, Reflectivity, Atmospheric particles, Sun, Virtual colonoscopy, Sensors, Photometry, Aerosols

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Proceedings Article | 2 February 2004 Paper

APEX: current status of the airborne dispersive pushbroom imaging spectrometer

Michael Schaepman, Klaus Itten, Daniel Schlaepfer, Johannes Kaiser, Jason Brazile, Walter Debruyn, Andreas Neukom, Hans Feusi, Peter Adolph, Renzo Moser, Thomas Schilliger, Lieve De Vos, Guido Brandt, Peter Kohler, Markus Meng, Jens Piesbergen, Peter Strobl, Jose Gavira, Gerd Ulbrich, Roland Meynart

Proceedings Volume 5234, (2004) https://doi.org/10.1117/12.513745

KEYWORDS: Spectroscopy, Calibration, Data acquisition, Interfaces, Human-machine interfaces, Algorithm development, Prisms, Sensors, Control systems, Navigation systems

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Proceedings Article | 2 February 2004 Paper

Calibration concept for potential optical aberrations of the APEX pushbroom imaging spectrometer

Daniel Schlapfer, Johannes Kaiser, Jason Brazile, Michael Schaepman, Klaus Itten

Proceedings Volume 5234, (2004) https://doi.org/10.1117/12.510640

KEYWORDS: Calibration, Sensors, Stray light, Data modeling, Point spread functions, Optical aberrations, Data processing, Image sensors, Image processing, Spectroscopy

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Proceedings Article | 2 February 2004 Paper

Assimilation of heterogeneous calibration measurements for the APEX spectrometer

Johannes Kaiser, Daniel Schlapfer, Jason Brazile, Peter Strobl, Michael Schaepman, Klaus Itten

Proceedings Volume 5234, (2004) https://doi.org/10.1117/12.511126

KEYWORDS: Calibration, Instrument modeling, Data modeling, Sensors, Spectroscopy, Data acquisition, Data processing, Filtering (signal processing), Algorithm development, Mathematical modeling

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Proceedings Article | 8 November 2002 Paper

Processing of large-volume airborne imaging spectrometer data: the APEX approach

Michael Schaepman, Daniel Schlaepfer, Jason Brazile, Stephan Bojinski

Proceedings Volume 4816, (2002) https://doi.org/10.1117/12.453795

KEYWORDS: Calibration, Spectroscopy, Data modeling, Software development, Atmospheric corrections, Sensors, Reflectivity, Algorithm development, Data acquisition, Airborne remote sensing

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Proceedings Article | 8 November 2002 Paper

Aerosol mapping over rugged heterogeneous terrain with imaging spectrometer data

Stephan Bojinski, Daniel Schlaepfer, Michael Schaepman, Johannes Keller

Proceedings Volume 4816, (2002) https://doi.org/10.1117/12.451623

KEYWORDS: Aerosols, Reflectivity, Short wave infrared radiation, Atmospheric particles, Sensors, Atmospheric modeling, Spectroscopy, Ocean optics, Databases, Visible radiation

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Proceedings Article | 23 January 2002 Paper

Geo-atmospheric processing of wide-FOV airborne imaging spectrometry data

Rudolf Richter, Daniel Schlapfer

Proceedings Volume 4545, (2002) https://doi.org/10.1117/12.453681

KEYWORDS: Atmospheric corrections, Sensors, Reflectivity, Image processing, Solar radiation models, Airborne remote sensing, Solar radiation, Imaging spectrometry, Imaging systems, Atmospheric modeling

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Proceedings Article | 17 January 2002 Paper

Performance requirements for airborne imaging spectrometers

Michael Schaepman, Daniel Schlaepfer, Andreas Mueller

Proceedings Volume 4480, (2002) https://doi.org/10.1117/12.453345

KEYWORDS: Sensors, Reflectivity, Signal to noise ratio, Spectrometers, Calibration, Atmospheric modeling, Airborne remote sensing, Imaging spectroscopy, Vegetation, Radiative transfer

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Proceedings Article | 27 October 1999 Paper

Simulation of APEX data: the SENSOR approach

Anko Boerner, Michael Schaepman, Daniel Schlaepfer, Lorenz Wiest, Ralf Reulke

Proceedings Volume 3753, (1999) https://doi.org/10.1117/12.366285

KEYWORDS: Sensors, Remote sensing, Sensing systems, Atmospheric optics, Ray tracing, Computer simulations, Atmospheric modeling, Reflectivity, Systems modeling, Data modeling

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Proceedings Article | 16 October 1998 Paper

PARGE: parametric geocoding based on GCP-calibrated auxiliary data

Daniel Schlaepfer, Michael Schaepman, Klaus Itten

Proceedings Volume 3438, (1998) https://doi.org/10.1117/12.328114

KEYWORDS: Sensors, Georeferencing, Image processing, Gyroscopes, Calibration, Statistical analysis, Imaging spectroscopy, Image resolution, Reconstruction algorithms, Data modeling

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Proceedings Article | 4 August 1997 Paper

Laboratory calibration and inflight validation of the Digital Airborne Imaging Spectrometer DAIS 7915

Peter Strobl, Andreas Mueller, Daniel Schlaepfer, Michael Schaepman

Proceedings Volume 3071, (1997) https://doi.org/10.1117/12.280599

KEYWORDS: Calibration, Spectroscopy, Integrating spheres, Spectral calibration, Optical spheres, Mirrors, Airborne remote sensing, Sensors, Reflectivity, Data acquisition

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Showing 5 of 18 publications

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